tinySpell VS iThenticate

Grammarly - Clear, effective, mistake-free writing everywhere you type.

Turnitin - Turnitin is preferred by educational institutions around the world for preventing plagiarism. Instructors at all levels of education can request that students use the service to submit papers, and Turnitin checks those papers for plagiarism.

Hunspell - Hunspell is the spell checker of LibreOffice, OpenOffice.

Unicheck - The plagiarism checker Unplag scans across the internet, repositories, open sources content and databases. It delivers real-time results and has no cached data.

DSpellCheck - Yet Another Notepad++ Spell-checking Plug-In

PlagScan - The Internet makes plagiarism a bigger problem than ever.